ARCv2: MCIP: Use IDU_M_DISTRI_DEST mode if there is only 1 destination core
ARC linux uses 2 distribution modes for common interrupts: round robin mode (IDU_M_DISTRI_RR) and a simple destination mode (IDU_M_DISTRI_DEST). The first one is used when more than 1 cores may handle a common interrupt and the second one is used when only 1 core may handle a common interrupt. However idu_irq_set_affinity() always sets IDU_M_DISTRI_RR for all affinity values. But there is no sense in setting of such mode if only 1 core must handle a common interrupt. Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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@ -181,6 +181,8 @@ idu_irq_set_affinity(struct irq_data *data, const struct cpumask *cpumask,
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{
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unsigned long flags;
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cpumask_t online;
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unsigned int destination_bits;
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unsigned int distribution_mode;
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/* errout if no online cpu per @cpumask */
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if (!cpumask_and(&online, cpumask, cpu_online_mask))
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@ -188,8 +190,15 @@ idu_irq_set_affinity(struct irq_data *data, const struct cpumask *cpumask,
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raw_spin_lock_irqsave(&mcip_lock, flags);
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idu_set_dest(data->hwirq, cpumask_bits(&online)[0]);
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idu_set_mode(data->hwirq, IDU_M_TRIG_LEVEL, IDU_M_DISTRI_RR);
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destination_bits = cpumask_bits(&online)[0];
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idu_set_dest(data->hwirq, destination_bits);
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if (ffs(destination_bits) == fls(destination_bits))
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distribution_mode = IDU_M_DISTRI_DEST;
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else
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distribution_mode = IDU_M_DISTRI_RR;
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idu_set_mode(data->hwirq, IDU_M_TRIG_LEVEL, distribution_mode);
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raw_spin_unlock_irqrestore(&mcip_lock, flags);
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